import Vue from 'vue'
import Router from 'vue-router'
import Login from './components/Login.vue'
import Home from './components/Home.vue'

Vue.use(Router)


const router = new Router({
    routes:[
        { path: '/',redirect: '/login' },
        { path: '/login',component:Login },
        { path: '/home',component:Home }
    ]
})

// 挂载路由导航守卫
router.beforeEach((to,from,next) => {
    // to将要访问的路径
    // from 代表从哪个页面跳转而来
    // next 是一个函数，表示放行
    // next() 放行  next('/login')  强制跳转

    if(to.path === '/login') return next();
    // 获取 token 
    const tokenStr = window.sessionStorage.getItem('token');
    if(!tokenStr) return next('/login');
    next();
})

export default router